Don't mix combinators and let else

Co-authored-by: Michael Goulet <michael@errs.io>

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -430,9 +430,12 @@ fn check_match(
         }
 
         let scrut_ty = scrut.ty;
-        let Ok(report) = analyze_match(&cx, &tarms, scrut_ty).map_err(|err| self.error = Err(err))
+        let report = match analyze_match(&cx, &tarms, scrut_ty) {
-        else {
+            Ok(report) => report,
+            Err(err) => {
+                self.error = Err(err);
                 return;
+            }
         };
 
         match source {